environment, the natural world around people, including the air, water, and land, pollution, the process of making air, water, or land dirty and harmful, recycle, to collect and process used materials so that they can be used again, protect, to keep someone or something safe from harm or damage, natural resources, materials such as water, forests, and minerals that come from nature and are useful to people, deforestation, the cutting down or removal of large areas of trees and forests

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